Units of Measure

University of Hawai‘i at Mānoa Food Science and Human Nutrition Program and Human Nutrition Program

In , there are two systems of commonly used measurements: Metric and US Customary. We need both because the US won’t adopt the metric system completely.

The Metric and US Customary System

These are commonly used prefixes for the Metric System:

 Micro- (μ) 1/1,000,000th (one millionth) Milli- (m) 1/1000th (one thousandth) Centi- (c) 1/100th (one hundredth) Deci- (d) 1/10th (one tenth) Kilo- (k) 1000x (one thousand times)

Mass

 Metric System US Customary System Conversions Microgram (μg) Ounce (oz) 1 oz = 28.35 g Milligram (mg) Pound (lb) 1 lb = 16 oz Gram (g) 1 lb = 454 g Kilogram (kg) 1 kg = 2.2 lbs

Volume

 Metric System US Customary System Conversions Milliliter (mL) Teaspoon (tsp) 1 tsp = 5 mL Deciliter (dL) Tablespoon (tbsp) 1 tbsp = 3 tsp = 15 mL Liter (L) Fluid ounce (fl oz) 1 fl oz = 2 tbsp = 30 mL Cup (c) 1 c = 8 fl oz = 237 mL Pint (pt) 1 pt = 2 c = 16 fl oz Quart (qt) 1 qt = 4 c = 32 fl oz = 0.95 L Gallon (gal) = 4 qt 1 gal = 4 qt

Length

 Metric System US Customary System Conversions Millimeter (mm) Inch (in) 1 in = 25.4 mm Centimeter (cm) Foot (ft) 1 ft= 30.5 cm Meter (m) Yard (yd) 1 yd = 0.9 m Kilometer (km) Mile (mi) 1 mi = 1.6 km

Learning Activities

Technology Note: The second edition of the Human Nutrition Open Educational Resource (OER) textbook features interactive learning activities.  These activities are available in the web-based textbook and not available in the downloadable versions (EPUB, Digital PDF, Print_PDF, or Open Document).

Learning activities may be used across various mobile devices, however, for the best user experience it is strongly recommended that users complete these activities using a desktop or laptop computer and in Google Chrome.